Is there a metal that Cannot be detected by a metal detector?

Stainless steel, by definition, has a low magnetic permeability, which means that it does not produce a signal strong enough to be recognized. Other items that a metal detector will not detect are gemstones, pearls, bones, diamonds, paper and stone figures.



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Aluminum foil is not likely to be detected by metal detectors. However, if you use X-rays, you will notice a big black void in the suitcase and will be forced to open it. As a result, aluminum foil can't be used to cover something else at the airport.

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Inform the TSA officer that you have an artificial knee, hip, other metal implant or a pacemaker, defibrillator or other internal medical device. You should not be screened by a walk-through metal detector if you have an internal medical device such as a pacemaker.

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